Lakes / Wisconsin / Marathon County

Lakes in Marathon County, Wisconsin

20 lakes counted in Marathon County - the largest is Big Eau Pleine Reservoir at 6,348 acres.

Lakes Counted

6,348 acres

Largest - Big Eau Pleine Reservoir

46 ft

Deepest - Big Eau Pleine Reservoir

Marathon County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.

All Counted Lakes

#	Lake	County	Surface Area	Max Depth
1	Big Eau Pleine Reservoir	Marathon	6,348 acres	46 ft
2	Lake Du Bay	Portage, Marathon	4,649 acres	30 ft
3	Lake Wausau	Marathon	1,851 acres	30 ft
4	Mosinee Flowage	Marathon	716 acres	18 ft
5	Berkhahn Flowage (Townline)	Marathon	445 acres	12 ft
6	Townline Reservoir*	Marathon, Portage	395 acres	10 ft
7	Teal Flowage	Marathon	370 acres	13 ft
8	North Honey Island Flowage	Marathon	340 acres	7 ft
9	Half Moon Lake	Marathon	217 acres	None ft
10	Pike Lake	Marathon	204 acres	34 ft
11	Big Bass Lake	Marathon	177 acres	13 ft
12	South Rice Lake	Marathon	175 acres	5 ft
13	Wausau Dam Lake	Marathon	152 acres	28 ft
14	Mead Wla Pool No. 5	Marathon	151 acres	8 ft
15	Cemetery Slough	Marathon	135 acres	None ft
16	Honey Island Flowage	Marathon	125 acres	7 ft
17	North Townline Flowage	Marathon	123 acres	9 ft
18	Main Flowage	Marathon	108 acres	8 ft
19	McMillan Reservoir	Marathon	105 acres	12 ft
20	Mission Lake	Marathon	104 acres	26 ft

Sources: Wisconsin DNR lake data; USGS. Verified October 28, 2026.